7. Oblicz.
a) 3×3^2
_____
3^8:3^7

b)5^7:5^7
______
5^5:5^4

c)(4^5×4^9):4^6
___________
4^2×4^4

d)(2^4:2^2×2^2)^2
_____________
2^6:2^2​